My ford lgt 165 started losing speed last year, I changed fluid and filter but it didn't seem to help. Also when I checked to fluid level it was very frothy and flowing out the inspection hole, it was only filled just until it started to run out inspection hole. Now the mowing deck is difficult to raise and lower as if there isnt enough power to move it. Does anyone have any ideas?

Thanks for the suggestion, I can't see how water could get in but could it be pulling in air somewhere.

Actually, that was my thought as well another thought is that the charge pump might be cavitating. water could possibly get in through the vent, or from condensation. Cavitiation would be caused by a plugged inlet forcing the pump to starve.

Its got HY-TRAN ultra hydraulic transmission oil, whatever is going on the volume of fluid seems to increase. I drained the fluid today and then refilled, there is what appears to be a fitting on the hydraulics to raise and lower the deck to bleed air as you would a brake line. This appears to have helped a little. I haven't seen a service manual, if one exists I'd like to see it. Anyways thanks for the help.

Its got HY-TRAN ultra hydraulic transmission oil, whatever is going on the volume of fluid seems to increase. I drained the fluid today and then refilled, there is what appears to be a fitting on the hydraulics to raise and lower the deck to bleed air as you would a brake line. This appears to have helped a little. I haven't seen a service manual, if one exists I'd like to see it. Anyways thanks for the help.